C#中RSA加密与解密的实例详解

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1. RSA加密与解密 -- 使用公钥加密、私钥解密

public class RSATool
 {
  public string Encrypt(string strText, string strPublicKey)
  {
   RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
   rsa.FromXmlString(strPublicKey);
   byte[] byteText = Encoding.UTF8.GetBytes(strText);
   byte[] byteEntry = rsa.Encrypt(byteText, false);
   return Convert.ToBase64String(byteEntry);
  }
  public string Decrypt(string strEntryText,string strPrivateKey)
  {
   RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
   rsa.FromXmlString(strPrivateKey);
   byte[] byteEntry = Convert.FromBase64String(strEntryText);
   byte[] byteText = rsa.Decrypt(byteEntry, false);
   return Encoding.UTF8.GetString(byteText);
  }
  public Dictionary<string,string> GetKey()
  {
   Dictionary<string, string> dictKey = new Dictionary<string, string>();
   RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
   dictKey.Add("PublicKey", rsa.ToXmlString(false));
   dictKey.Add("PrivateKey", rsa.ToXmlString(true));
   return dictKey;
  }
 }

测试：

RSATool myRSA = new RSATool();
   Dictionary<string, string> dictK = new Dictionary<string, string>();
   dictK = myRSA.GetKey();
   string strText = "123456";
   Console.WriteLine("要加密的字符串是：{0}", strText);
   string str1 = myRSA.Encrypt("123456", dictK["PublicKey"]);
   Console.WriteLine("加密后的字符串：{0}", str1);
   string str2 = myRSA.Decrypt(str1, dictK["PrivateKey"]);
   Console.WriteLine("解密后的字符串：{0}", str2);

2. RSA加密与解密 -- 使用同一个密钥容器进行加密与解密

 public class RSAToolX
 {
  public string Encrypt(string strText)
  {
   CspParameters CSApars = new CspParameters();
   CSApars.KeyContainerName = "Test001";
   RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(CSApars);
   byte[] byteText = Encoding.UTF8.GetBytes(strText);
   byte[] byteEntry = rsa.Encrypt(byteText, false);
   return Convert.ToBase64String(byteEntry);
  }
  public string Decrypt(string strEntryText)
  {
   CspParameters CSApars = new CspParameters();
   CSApars.KeyContainerName = "Test001";
   RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(CSApars);
   byte[] byteEntry = Convert.FromBase64String(strEntryText);
   byte[] byteText = rsa.Decrypt(byteEntry, false);
   return Encoding.UTF8.GetString(byteText);
  }
 }

测试：

RSAToolX myRSA = new RSAToolX();
   string strText = "123456";
   Console.WriteLine("要加密的字符串是：{0}", strText);
   string str1 = myRSA.Encrypt("123456");
   Console.WriteLine("加密后的字符串：{0}", str1);
   string str2 = myRSA.Decrypt(str1);
   Console.WriteLine("解密后的字符串：{0}", str2);